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What does Google think about : JavaScript & Technical SEO

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This category compiles all official Google statements regarding JavaScript and technical aspects of search engine optimization. Modern JavaScript frameworks (React, Angular, Vue.js) and web application architectures (SPA, SSR, CSR) present critical challenges for crawling and indexing. Google's guidance on JavaScript rendering, dynamic DOM manipulation, AJAX implementation, and API calls is essential for ensuring client-side content visibility. SEO professionals will find authoritative positions on implementation best practices, differences between server-side and client-side rendering, and recommendations for optimizing load times while guaranteeing content accessibility to search crawlers. Understanding data formats (JSON, XML) and their SEO implications completes this vital resource. These official declarations help prevent common technical implementation mistakes that can severely impact the search performance of modern websites and JavaScript-powered applications. Access to Google's verified positions on these technical matters enables practitioners to make informed architectural decisions and implement JavaScript solutions that maintain strong organic search visibility while delivering enhanced user experiences.
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★★★ Does the crawl budget truly impact the rendering phase of your JavaScript pages?
The crawl budget affects not only the initial crawl but also the rendering, as Google needs to fetch additional resources (CSS, JavaScript, API). A poor cache can force Google to continuously re-downl...
Martin Splitt Jul 14, 2020
★★ Should you ditch POST for crawlable APIs and switch everything to GET?
Google cannot cache POST requests, leading to greater crawl budget consumption. For rendering APIs, use GET requests. GraphQL can be employed to reduce the number of requests, but only in GET mode....
Martin Splitt Jul 14, 2020
★★ How does content hashing in URLs truly enhance your crawl budget?
To optimize caching and crawl budget, use content hashes in file names (e.g., application.AEF3CE.js) instead of generic names. This allows Google to cache resources indefinitely, and only new hashes w...
Martin Splitt Jul 14, 2020
★★ Should You Avoid JavaScript Redirects for SEO?
Gary Illyes explained on Twitter that implementing redirects from one URL to another (in this case based on the visitor's IP address to redirect them to a specific site depending on the country) was n...
Gary Illyes Jul 13, 2020
★★ Should you really forgo a JavaScript fallback for native lazy loading?
When using the img element's loading="lazy" attribute (native lazy loading), there is no need to prepare a fallback for Googlebot since JavaScript is unnecessary....
金谷武明 Jul 02, 2020
★★ Does JSON-LD FAQ Schema really slow down your site?
Adding JSON-LD markup (like FAQ Schema) has only a negligible effect on page speed. It adds a few bytes, but this is insignificant compared to the JavaScript and images typically loaded. The browser p...
Martin Splitt Jul 01, 2020
★★★ How can you verify if your JavaScript content is truly indexable by Google?
To confirm if content loaded via scripts or widgets is indexable, use Google’s testing tools (URL Inspection Tool, Mobile-Friendly Test, Rich Results Test) and examine the rendered HTML. If the conten...
Martin Splitt Jul 01, 2020
★★ Does JSON-LD Really Slow Down Your Loading Time?
Adding structured JSON-LD markup (such as FAQ Schema) has a negligible impact on page speed. It only accounts for a small percentage of the total weight compared to JavaScript and images, and the brow...
Martin Splitt Jul 01, 2020
★★★ Is content behind login really invisible to Google?
Any content located behind a login system is invisible to search engines and has no SEO impact. Webmasters can therefore freely implement JavaScript interfaces for logged-in users without SEO consider...
Martin Splitt Jul 01, 2020
★★ Should you really disable JavaScript on your pre-rendered pages for Googlebot?
If you’re using pre-rendering for Googlebot because JavaScript poses an issue, but then leave JavaScript active on the pre-rendered page, you need to check if it really resolves the problem. If not, i...
Martin Splitt Jul 01, 2020
★★★ Does switching JavaScript frameworks really ruin your SEO?
A simple change of technology (e.g., from Angular to Vue/Nuxt) should not affect SEO as long as the content, site structure, and URLs remain identical. Any drop in traffic observed during a migration ...
Martin Splitt Jul 01, 2020
★★ Is it true that Googlebot can do without pre-rendering?
In 90% of cases, pre-rendering is unnecessary for Googlebot because it executes JavaScript. If pre-rendering is used to work around a JavaScript issue, it is essential to ensure that any remaining Jav...
Martin Splitt Jul 01, 2020
★★★ Does rendered HTML really ensure JavaScript indexing?
To determine if content loaded by JavaScript is indexable, Google’s testing tools (URL Inspection Tool, Mobile-Friendly Test, Rich Results Test) should be used to examine the rendered HTML. If the con...
Martin Splitt Jul 01, 2020
★★ Does FAQ Schema markup hurt your conversion rate?
FAQ markup is especially effective for informational queries, not really for customer acquisition. It allows users to quickly access information without visiting the site. If the answers are too comme...
Martin Splitt Jul 01, 2020
★★ Should you really redirect Googlebot to www to bypass CORB errors?
It is technically acceptable to redirect only Googlebot to the www domain while keeping users on the non-www version to avoid CORB errors caused by a service worker. However, Martin recommends fixing ...
Martin Splitt Jul 01, 2020
★★ Is the FAQ Schema markup actually useless for your product pages?
The FAQ Schema markup is mainly useful for informational queries and less effective for direct customer acquisition. It allows users to quickly access information, particularly for customer service qu...
Martin Splitt Jul 01, 2020
★★ Should you treat Googlebot differently from users to manage redirects?
While it is technically possible to redirect only regular users to the www domain and not Googlebot, this approach makes testing and debugging more difficult. It is better to address the root cause of...
Martin Splitt Jul 01, 2020
★★★ Does changing your JavaScript framework lead to a drop in Google rankings?
Changing a JavaScript framework (e.g., moving from Angular to Vue/Nuxt) should not in itself lead to a drop in ranking, as Google focuses on the content, not on the technology being used. The drops ob...
Martin Splitt Jul 01, 2020
★★★ Why is JavaScript more costly to crawl than images or videos?
JavaScript is the most costly resource on a website for search engines, unlike images or videos. Server-Side Rendering (SSR) with client-side hydration offers the best balance: it provides initial con...
Martin Splitt Jun 30, 2020
★★★ Should you completely block an e-commerce site during a temporary closure?
Completely blocking a site (for instance, displaying only 'closed due to COVID') leads to the rapid deindexing of all pages. In contrast, keeping the site active with only the cart deactivated allows ...
John Mueller Jun 26, 2020
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